Membrane Transport

Question 1

Water lean body mass %

Answer 1

65.8%

Question 2

Hydrophilic
Hydrophobic
Amphiphilic

Answer 2

dissolve in water
insoluble in water
mixed properties

Question 3

Fick’s law of diffusion

Answer 3

Amount moved = Coefficient x Area x Conc gradient

Question 4

Osmosis

Answer 4

Movement of water or other solvent through a semipermeable membrane that permits the passage of water but not the solute particles.

Question 4

Osmotic pressure

Answer 4

pressure sufficient to stop the flow of water

Osmotic pressure (pi) = MRT
M - molarity
R - universal gas constant
T - Absolute temperature (310K)

Question 5

Osmolarity
Osmolality

Answer 5

Moles of solute particles per litre of solution
Moles of solute particles per kg pf water

Osmole - unit of osmotic concentration

Question 6

Tonicity

Answer 6

The influence of its osmotic concentration on the volume of cells.
Same osmotic conc = iso osmotic.

Not all iso osmotic solutions are isotonic with cells. As the solutions may go down chemical gradient. UREA

Question 7

Total body water

Answer 7

Extracellular = intracellular water
extracellular = plamsa = intersticial water

Tritiated water for total body water
evans dye for plasma

Question 8

Plasma membrane size

Answer 8

About 5/6 nanometres

Question 9

Ion channels

Answer 9

Central pore through which ions diffuse
Passive diffusion
Are selective for ion
High capacity for transport
can be Leak channels or Gated channels

Question 10

Carrier proteins

Answer 10

Transport small ions finish notes

Question 11

Transport of macromolecules

Answer 11

Exocytosis - vesicle fuses with plasma membrane and releases components
constituative - performed by all cells to release stuff
regulated - triggered by chemical or electrical signal.
Endocytosis -
Phagocytosis
Pinocytosis
Receptor mediated transport.